Improvement in pumps



v4UNITRR STATES PA'rRNT- Orrron MINFORD s. CLARK, YORK, Y1v. Y.,`Ass1GNoR `To oHARLRs yiiAI-:R'I-

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IMPRovEMENT INY'PUMPS.

Specification forming part of Letters Patent No. 156,279, dated October 27, 1874; application filed v i September 29, 1.874. l

To all whom it mag/concern:

Be it known that I, MINFoRD 4S. CLARK. of New York, N. YI, have invented certain Improvements in Double-Acting Force-Pumps having two arms inclined upward iu opposite directions, one of these arms being actedupon by the face of the piston,so as to rock open the valve, and the other arm projecting through the piston and striking againstthe pistonvalve, so as to raise that from its seat when the pistou is fully depressed.

I also provide two air-cocks, the one for the admission of air into the induction-chamber and water-supply pipe, and the other for the admission of air into the air-chamber of the pump, and through that -into the cylinder above the piston-valve. In the case of a double-acting force-pump, I provide each cylinder with the valve-trippin g device, as shown.

The'accompanying drawing exhibits a vertical section ofa double-acting force-pump embodying my improvements. The base or standard A has a raised upper edge, makingl it a drip-cup, and supports the induction-chamber b, to which the water-supply pipe b]L is attached. The induction-chamber extends across the base, and furnishes a bearing, upon which the cylinders c and d are bolted, and opensat either end into the cylinders c and d, which are, respectively, provided with the pistons c1 and d1; The piston-stems are packed in the cylinder-heads o2 and d2 in the usual manner, and connected by short pitmen to the rocking-beam e, which is worked by the lever el.

The Acylinders communicate at their upper ends, by the transverse passages c3 and d3, with the eduction-chamber fand eduction-pipef1. At the bottom of the cylinders are "hinged valves c4 and d4, respectively, seated upon the openings into the induction-chamber. The pistons are also provided with hinged valves o5 and d5, opening upward.

By reference vto the drawing, it will Ybe seenA that the piston d1 is shown in the position o t' being fully depressed, its further downward movement being prevented by the resting of the beam toe or stop ez-upon the top of the air-chamber g, to which the beam e is pivoted. It will beseen, also, that the face of the piston dl rests upon an arm attached to the valve d4, and inclined backward from its hinge, so that the valve is rocked upward by the piston. It

will also be seen that in the position thus pre-V scribed by the operation of the stop e2 the other arm of this valve projects through the opening in the piston, and strikes against the under side of the piston-valve d5, so as to raise that in a prescribed degree. There is, therefore, an open communication between the induction-chamber and the upper part of the cylinder d. If, under these circumstances, the air-cock b2 is opened, any water contained in the cylinder d falls by its own gravity into the induction-chamber, and thence into and through the water-supply pipe to the water level at its source. Upon reversing the movement of the pump, the opposite piston c1 is depressed, and operates in the same way upon the valves o4 and c5, allowing water in that cylinder to drain through the valves and into the induction-chamber, land so on. Another aircock, f2, situated at the bottom of the eduction-chamber f, when opened, allows air to enter the eduction-chamber, or, if there be water'there, permits such water to escape from the ednction-chamber and fall upon the top of the base, which is arranged as a drip-box, and provided with a small discharge-pipe, a1. It will thus be seen that if both the air-cocks are opened a few motions of the beam e suffice to completely drain all parts ofthe pump from water, so that any injury to them arising from freezing is wholly avoided.

When it is desired to work the pump, the air-cocks are closed, and then its operation is precisely the same as other force-pumps--that is, in the upward movement of the piston water is sucked into thecylinder from the induction-chamber, and in its downward movement such water is retained by the closing of Vthe lower valve, and forces its way through the piston-valve into the upper part of the cylinder, from which it is ejected Yby the next up! ward movement of the piston into the eductionchamber and eduction-pipe f1. By this arrangement of the parts, my pump sucks either air or water, as may be desired. chamber g has a ilanged base, which is bolted to the iiange of the eduction-chamber.` The cylinder-heads c2 and d2, respectively, rest upon and are bolted to the cylinder-flanges, the usual packing being interposed in all -tllree cases. By detaching the rocking-beam from its axis, and from the piston-stems, either one of the cylinders, or the air-chamber, may be separately removed by merely unbolting it from the flangei z' i fi, which aiiords a seat upon the same horizontal plane for both cylinder-heads, and for the air-chamber.

By this construction, convenience of repairs is greatly facilitated because access can thus The airbe had to either cylinder, or to the aircham` 

